Andre subtracted 600 from 657. What does the 600 represent? Andre wrote 10 above the 200, and then subtracted 30 from 57. How is the 30 related to the 10?

What do the numbers 200, 10, and 9 represent?

What is the meaning of the 0 at the bottom of Andre’s work?

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

What signals you that factoring by grouping is the best method to use when factoring a problem?

Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9